- From: Kazuyuki Ashimura <ashimura@w3.org>
- Date: Thu, 4 Feb 2016 03:06:50 +0900
- To: "public-web-and-tv@w3.org" <public-web-and-tv@w3.org>
- Message-ID: <CAJ8iq9XO=GdP-b54kO51wHzrDyJA5kV9fqciRY6VL1gG7AWVuQ@mail.gmail.com>
available at:
https://www.w3.org/2016/02/03-webtv-minutes.html
also as text below.
Thanks a lot for taking notes, Nilo!
Kazuyuki
---
[1]W3C
[1] http://www.w3.org/
- DRAFT -
Web&TV IG - Cloud Browser TF
03 Feb 2016
See also: [2]IRC log
[2] http://www.w3.org/2016/02/03-webtv-irc
Attendees
Present
Louay_Bassbouss, Stefan_Kaiser, Bill_Rose,
Bryan_Sullivan, Colin_Meerveld, John_Foliot,
Julian_Sitkevich, Nilo_Mitra,
Ronen_Mizrahi(Invited_Guest), Yosuke_Funahashi,
Kaz_Ashimura, Kumanan_Yogaratnam, Paul_Gausman
Regrets
Chair
Alexandra
Scribe
Nilo
Contents
* [3]Topics
1. [4]Agenda
2. [5]Introduction
3. [6]Time slot for the call
4. [7]Technical discussion approach
5. [8]Colin's initial concept of Cloud Browsers
* [9]Summary of Action Items
* [10]Summary of Resolutions
__________________________________________________________
<kaz> scribe: Nilo
<kaz> scribenick: NiloMitra
Agenda
Agenda includes:
1) choose a better time slot of the call ( for Asia
participants)
2) Discuss emails from Colin and Louay
3) How to proceed on use cases and architecture
Introduction
Introduction and roll calls followed
<bryan> hi, this is Bryan from AT&T. We will be following this
work as something potentially of use in our TV services e.g.
u-Verse and DirecTV. Maybe providing some use cases and
requirements as the work proceeds. In a tangential context, we
are heavily focused on evolving networks toward cloud
deployment (e.g. through NFV) and hosting end-user apps/clients
in the
<bryan> cloud is a potential component of that.
John wants accessibility to be met for the cloud browser
environment also
he is specifically looking to ensure that people with
disabilities can interact with appropriate UIs
Time slot for the call
The time slot issue will be clarified with Entrix (Korea) and a
proposal made by Alexandra
Technical discussion approach
Alexandra: Cloud browser is not trivial and a straightforward
approach via use cases may not always be appropriate
... From DT perspective, cloud browser is a run time
environment that runs in the cloud
... A browser in the network leads to a "UI video", which is
the video returned by the cloud browser
... Video and UI Video is sent as one stream, but could also
separate these two where the video is returned from the PVR or
a CDN
... From IPTV telco perspective, could use the second approach
... Refer to these as the single and double stream, and
describe these on the Wiki
... Also define what a Thin client is
<bryan> Is the draft linked to the wiki yet?
John: Question about UI Video - is it the controls like pause,
fast forward, or is it interactive menus?
Alexandra: She means both of them. Everything which was
executed locally in the device is shifted to the cloud and is
executed there just like a standard browser
... The code is executed in the cloud browser and streamed down
as the UI video
... She will put some explanations on the Wiki.
<bryan> So interactive elements are not directly handled by the
thin client, but in the cloud client, and any correlation to
mouse etc position/action is handled by the cloud browser?
(requiring a stream of thin client UI events?)
Kaz: We should clarify the policy of queue management during
the call - use Q+ to raise your hand
... Do a basic use case to describe what a cloud browser is
Alexandra: The use cases also need a relationship to the
architecture, which describe the different approaches to
defining a cloud browser
... Work on architecture and use cases in parallel would be her
preferred way of working
<Zakim> JF, you wanted to point to MAUR as some UI requirements
for Accessibility
<JF>
[11]https://www.w3.org/WAI/PF/media-a11y-reqs/#system-requireme
nts
[11] https://www.w3.org/WAI/PF/media-a11y-reqs/#system-requirements
John: Want to point out that when HTML5 was introduced, they
dealt with accessibility from both content and system
perspective
... It seems like we are creating a cloud media player in the
cloud
Coiln: The player in Active Video also does the accessibility
functionality also in the cloud
<bryan> So there needs to be an event stream consumable by the
cloud client that includes pointer events and also keyboard or
any other accessible interface events.
John: the system requirements is agnostic on where the
accessibility functionality (e.g., keyboard) is provided.
example - using a keyboard where they cannot use point and
click
... Build out the solution so that it remains accessible for
ALL users
Alexandra: Could it also be a small use case? John: Be happy to
build our use cases for accessibility - 4 types: visual,
mobility, auditory, cognitive impairments
John: unsure that these 4 user groups can have access
<Zakim> bryan, you wanted to mention the items I noted
Bryan: seems like the user is interacting with a thin client
where the user interacts via events (inputs) with the cloud
<JF> +1 to Bryan
Bryan: There should be an appropriate response to all the user
inputs from the cloud browser
Nilo: Are thin client and cloud browser equivalent terms?
Alexandra: Cloud browser uses a "zero client" as all STB
functions are moved to the cloud. However, certain logics still
needed in the STB so that screens can be overlaid
<bryan> Nilo, there could be options as to what types of
functionality are supported by the user-side (home or mobile
device), and where those functions are implemented (STB, user
device, cloud-based client). We would need to drive those
things as we get to a more common understanding of the concept
and arch options.
<kaz> [12]accessibility use cases
[12] https://www.w3.org/2011/webtv/wiki/New_Ideas#Other_Topics
Kaz: Web & TV interest group also worked on accessibility uses
cases
Colin's initial concept of Cloud Browsers
Colin was asked to explain his input
<yosuke>
[13]https://lists.w3.org/Archives/Public/public-web-and-tv/2016
Jan/0005.html
[13] https://lists.w3.org/Archives/Public/public-web-and-tv/2016Jan/0005.html
<kaz> Colin's writeup above
<kaz> [14]Colin's diagram
[14] https://www.w3.org/2011/webtv/wiki/images/a/aa/W3c_-cloud_browser_TF-_initial_concepts.png
Colin showed a figure. To him, cloud browser is a regular
browser living in the cloud environment
Cloud browser is responsible for all accessibility. Example, a
keyboard requires all key strokes to be passed to the cloud
browser
Out of band media from a PVR is fed to the local run time
environment to "mix" with the control stream
John: As we cannot physically wire keyboard, is a companion
screen used to connect with the cloud browser
Colin: You could also have the physical keyboard tap into the
thin client run time environment
<bryan> Websockets could be a good mechanism for delivery of
the signalling events to the cloud browser.
Colin: Several ways are possible to make cloud browser
accessible. try to make it as normal as possible, so that the
browser does not need to know it is running in the cloud. then
most accessibility methods work
bryan: Out of band media means that ti can consume local
resources. This needs support for several APIs which may not
make this runtime environment "thin"
Colin: try and keep it as thin as possible
Kaz: can we add this figure to the wiki page?
Colin: This is just one of many possible solutions. However,
leave it open. this can be a starting point
Alexandra: The group has to define the gaps
... Via use cases.
Colin: The cloud environment sends the UI to the runtime via
stream and some sort of signalling is needed for a session
setup
<bryan> ... Probably a RESTful API accessed by the thin client
and served by the cloud browser would be useful for session
management.
Alexandra: Want to discuss in group with a general overview of
the arch so that we can discuss the different approaches. The
use cases need to take into account the interactions between
the cloud browser and the local runtime environment
<bryan> Once a session was started, a websocket connection
could be used for signalling and any non-video feedback to the
thin client.
Colin: Assume that the stream is a video stream. Alongside a
video stream you can also send images. The runtime environment
can mix the stream with a series of images
Alexandra: Are these different architectures?
... Where would be the media player be placed? Ina zero clinet,
the media player could also be in the cloud.
<bryan> The result of cloud-browser-based dialogs e.g.
permissions or other dialogs, would need to be passed back down
to the thin client if the client was intended to access local
resources. The security of that would be a key consideration...
Colin: In a PVR, you don't send the video to the cloud and then
send it back. therefore you need something in the client for
out-of-band media.
Alexandra: We don't identify protocols; just the architecture.
This will be done afterwards
Bryan: Talk about use cases and requiements, but don't document
the architecture options in the use cases and requirements
document
Alexandra: Discuss cloud 360 use case
Louay: They have a cloud server which renders a video of just
what was requested (e.g, a particular angle)
... Don't stream the whole 360 degree view but just what was
requested. Existing JS libraries rendering 360 video need use
case to only send just what is requested
... IS this a good use case for the cloud browser?
Alexandra: Make up a couple of use cases and add to the Wiki
Louay: Will do so with more details/diagrams
Alexandra: Will add use cases for the cloud browser on how
exisiting use cases work (PVR, interactivity, EPG etc.)
Louay: Want to make sure that their use cases are at the same
level as those submitted by others. Their use cases are from an
end user perspective, not a systems perspective.
Alexandra: His use case could be for virtual/augmented reality
<kaz> [15]Use Case wiki
[15] https://www.w3.org/2011/webtv/wiki/Main_Page/Cloud_Browser_TF/UseCases
Alexandra: Summarizing the meeting.
Kaz: may wish to revisit the template for the use cases. need a
motivation field and a Reviewer field
Ronen: We take HTML content that runs in a cloud browser. We
need to see ahat types of HTML5 content we have (e.g., EPG) and
see what happens if this is not run on a local browser.
... Need to look at OTT content, games etc. Each of these would
be a use case.
... Use cases would be on user interaction with these types of
applications where the browser is in the cloud - what gaps
exist?
Alexandra: Will discuss with Ronen before putting such use
cases on the Wiki
... Will also align it with other use cases such as EPG, HbbTV
etc.
No further questions or discussion. Meeting closed.
Continue discussions via email.
Summary of Action Items
Summary of Resolutions
[End of minutes]
__________________________________________________________
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--
Kaz Ashimura, W3C Staff Contact for Auto, WoT, TV, MMI and Geo
Tel: +81 3 3516 2504
Received on Wednesday, 3 February 2016 18:08:10 UTC